|Drawing of a Yan Yue Dao, from 'Chou Hai Tu Bian (《籌海圖編》)'.|
Yan Yue Dao is very similar to Zhan Ma Dao (斬馬刀) and can be used in pretty much the same manner (as both are glaive-like polearms). However, Yan Yue Dao has a trailling point blade and a sharpened protrusion on the back of its blade that aids in parrying, which differentiate it from other Chinese glaives. It also has a butt spike.
Most Yan Yue Dao are extremely heavy and considered impractical for the battlefield. Nevertheless, lightweight version intended as practical weapon do exist.